LASER OSCILLATOR

摘要

A laser oscillator of a low resonator loss capable of utilizing a solid gain medium without a high-degree polishing operation. A solid gain medium (1) is held in a transparent container (3) with the solid gain medium immersed in a liquid (2) having a refractive index matching that of the solid gain medium (1). When the excitation light (50) is applied to the transparent container (3), the solid gain medium (1) is laser-excited, laser oscillation starts in an optical resonator comprising a rear mirror (M1) and an output mirror (M2), and a laser beam (S') is outputted from the output mirror (M2). Since the solid gain medium (1) is immersed in the refractive index-matched liquid (2), interface scattering is minimized even when the medium has a rough surface. A temperature rise at the inner side and outer side of the transparent container (3) is avoided by circulating the refractive index-matched liquid (2) by a circulating cooling unit (8).